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The reason that they don't put it in the oil ( crankcase ), is because todays motor oil has all the detergent & additives to keep your block clean in the oil passages & every where oil belongs within the engine block

If you were to buy a gunked up vehicle, that was not serviced properly, then possibly adding it to the crankcase might break gunk loose & you would do it not too long before a oil & filter change.
 
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